Sponge mop head



FIG. 1 is a top, front, and left-side perspective view of a sponge mop head showing the new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being identical;

FIG. 3 is a side elevational view thereof; and,

FIG. 4 is a top plan view thereof. 

The ornamental design for a sponge mop head, as shown and described. 